CN108020886B - MEMS optical fiber attenuator - Google Patents
MEMS optical fiber attenuator Download PDFInfo
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- CN108020886B CN108020886B CN201610961710.XA CN201610961710A CN108020886B CN 108020886 B CN108020886 B CN 108020886B CN 201610961710 A CN201610961710 A CN 201610961710A CN 108020886 B CN108020886 B CN 108020886B
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- reflector
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/24—Coupling light guides
- G02B6/26—Optical coupling means
- G02B6/264—Optical coupling means with optical elements between opposed fibre ends which perform a function other than beam splitting
- G02B6/266—Optical coupling means with optical elements between opposed fibre ends which perform a function other than beam splitting the optical element being an attenuator
Abstract
The invention discloses an MEMS optical fiber attenuator, which sequentially comprises a light output collimator, a first reflector, a second reflector, a third reflector and a light receiving collimator along the propagation direction of light, wherein the first reflector is driven to rotate by MEMS, the reflecting surfaces of the second reflector and the third reflector are parallel and arranged oppositely, the light output collimator collimates light beams and then emits the light beams to the first reflector, the light beams are reflected to the second reflector by the first reflector, the light beams reflected by the second reflector are reflected to the third reflector, and the light beams enter the light receiving collimator after being reflected for a plurality of times between the second reflector and the third reflector. According to the invention, by folding the reflection light path and passing through the distance between the ultralong collimators, the coupling mismatch loss generated by the translation of the light spot introduced by small-angle change is far larger than the coupling mismatch loss of the light beam caused by angle change, so that the lower PDL and WDL are obtained.
Description
Technical Field
The invention relates to the field of optical fiber communication, in particular to an MEMS optical fiber attenuator.
Background
The Variable Optical Attenuator (VOA) is a common device in optical communication networks, and can arbitrarily attenuate required light intensity according to the requirements in an optical path. The MEMS optical fiber attenuator is a common variable optical attenuator, which uses MEMS as a main control element and achieves the purpose of optical attenuation by controlling the angle change of the mirror on the MEMS to cause the change of the propagation direction of the light beam.
Fig. 1 is a schematic structural diagram of a conventional MEMS optical fiber attenuator, which mainly includes an MEMS1 and a dual optical fiber collimator 2, where an optical signal enters the collimator through one of the optical fibers of the dual optical fiber collimator 2, and is collimated by the optical fiber collimator and then emitted to a mirror of the MEMS, and then reflected by the MEMS mirror and returned to the collimator, and then coupled and output from the other optical fiber of the collimator. The purpose of controlling the light attenuation is realized by controlling the rotation of the MEMS upper reflecting mirror and changing the propagation direction (angle) of a reflected light beam on the MEMS reflecting mirror. The MEMS optical fiber attenuator is simple in structure and easy to assemble, and is the most common structure of the MEMS optical fiber attenuator. However, the PDL and WDL of the MEMS fiber attenuator are not particularly good in general, and are two very important indexes of the variable optical attenuator, and the PDL of the MEMS fiber attenuator is usually 0.3dB and the WDL of the MEMS fiber attenuator is usually 0.5dB at 20dB attenuation.
Fig. 2 is a schematic diagram of the attenuation principle of the optical fiber attenuator, which comprises two single-fiber collimators, a collimator 1 and a collimator 2, wherein light beams are transmitted from the collimator 1 to the collimator 2 for coupling out. In this configuration, the light attenuation is mainly caused by the coupling mismatch between the collimator 1 and the collimator 2, i.e. the coupling of the light emitted by the collimator 1 to the collimator 2 is mainly caused by the angular misalignment of the light beam (offset by θ) and the misalignment of the light beam (offset by Δ d). Since the conventional MEMS fiber attenuator (as shown in fig. 1) has a short propagation path, generally <5mm, the main reason for the optical intensity attenuation is caused by the angular mismatch of the beam, which is also one of the reasons for the poor PDL and WDL indexes of the MEMS fiber attenuator.
Disclosure of Invention
To address the deficiencies of the prior art, it is an object of the present invention to provide a MEMS fiber optic attenuator that achieves a lower PDL and WDL.
In order to achieve the purpose, the invention adopts the following technical scheme:
the utility model provides a MEMS optical fiber attenuator, its propagation direction along light includes light output collimator, first speculum, second mirror, third speculum and light receiving collimator according to the preface, it is rotatory that first speculum passes through the MEMS drive, the plane of reflection of second mirror and third speculum is parallel and set up in opposite directions, the light output collimator is emergent to first speculum after with the beam collimation on, the beam reflects to the second mirror through first speculum again, the beam reflection that reflects out through the second mirror is on the third speculum, the beam reflects a plurality of times between second mirror and third speculum and gets into light receiving collimator afterwards.
Further, the MEMS optical fiber attenuator also comprises a fourth reflecting mirror, the light beam is reflected to the fourth reflecting mirror after being reflected for a plurality of times between the second reflecting mirror and the third reflecting mirror, and the light beam reflected by the fourth reflecting mirror enters the light receiving collimator.
The light output collimator and the light receiving collimator are both single-fiber collimators.
The MEMS drives the first mirror to rotate so as to change a direction of propagation of the light beam reflected by the first mirror.
The distance between the light output collimator and the light receiving collimator can be adjusted by changing the number of reflections of the light beam between the second mirror and the third mirror.
By adopting the technical scheme, the invention has the following technical effects:
the MEMS optical fiber attenuator is different from the traditional MEMS optical fiber attenuator in that the coupling mismatch loss generated by introducing small-angle (theta) change into light spot translation (delta d) through folding a reflection light path (a plurality of reflections of light beams on a second reflecting mirror and a third reflecting mirror) through the distance between the super-long collimators is far larger than the coupling mismatch loss of the light beams caused by angle change, so that lower PDL and WDL are obtained. The distance L between the light output collimator and the light receiving collimator of the present invention can be adjusted as desired, for example, the number of times the light beam is reflected on the second mirror and the third mirror is increased, that is, the length of L can be increased.
Drawings
The invention is described in further detail below with reference to the following figures and detailed description:
FIG. 1 is a schematic structural diagram of a conventional MEMS optical fiber attenuator;
FIG. 2 is a schematic diagram of the attenuation principle of the optical fiber attenuator;
FIG. 3 is a schematic structural diagram of the MEMS optical fiber attenuator according to the present invention.
Detailed Description
As shown in fig. 3, the MEMS optical fiber attenuator of the present invention sequentially includes a light output collimator 5, a first reflecting mirror 1, a second reflecting mirror 2, a third reflecting mirror 3, and a light receiving collimator 6 along a light propagation direction, the first reflecting mirror 1 is driven to rotate by MEMS7, reflecting surfaces of the second reflecting mirror 2 and the third reflecting mirror 3 are parallel and are disposed opposite to each other, the light output collimator 5 collimates a light beam and emits the light beam to the first reflecting mirror 1, the light beam is reflected by the first reflecting mirror 1 to the second reflecting mirror 2, the light beam reflected by the second reflecting mirror 2 is reflected to the third reflecting mirror 3, and the light beam is reflected between the second reflecting mirror 2 and the third reflecting mirror 3 several times and enters the light receiving collimator 6.
In this embodiment, the MEMS fiber attenuator further includes a fourth mirror 4, the light beam is reflected on the fourth mirror 4 after being reflected between the second mirror 2 and the third mirror 3 for several times, and the light beam reflected by the fourth mirror 4 enters the light receiving collimator 6.
The light output collimator 5 and the light receiving collimator 6 are both single-fiber collimators.
The MEMS7 may drive the first mirror 1 to rotate so as to change the direction of propagation of the light beam reflected by the first mirror 1. The distance between the light output collimator 5 and the light receiving collimator 6 can be adjusted by changing the number of reflections of the light beam between the second mirror 2 and the third mirror 3.
The working principle of the invention is as follows: by folding the reflection light path, namely, the light beam is reflected on the second reflecting mirror and the third reflecting mirror for a plurality of times, the small angle (theta) change is led to the light spot translation (delta d) through the distance between the super-long collimators, so that the coupling mismatch loss is far larger than the coupling mismatch loss of the light beam caused by the angle change, and the lower PDL and WDL are obtained. If the output spot diameter of the collimator is 0.4mm, and the propagation distance L = L2+ L3+ … … L7=100mm, then θ =0.2 ° can make the spot coupling offset Δ d =0.35mm, so that the mismatch loss caused by the coupling offset Δ d is much larger than the loss caused by the angular θ change of the light beam. In addition, the distance between the light output collimator and the light receiving collimator can be adjusted according to the requirement.
Claims (5)
1. A MEMS fiber optic attenuator, comprising: the MEMS optical fiber attenuator sequentially comprises a light output collimator, a first reflector, a second reflector, a third reflector and a light receiving collimator along the light propagation direction, the first reflector is driven to rotate by an MEMS, the reflecting surfaces of the second reflector and the third reflector are parallel and arranged oppositely, the light output collimator collimates light beams and then emits the light beams to the first reflector, the light beams are reflected to the second reflector by the first reflector and then reflected to the third reflector by the second reflector, the light beams enter the light receiving collimator after being reflected for a plurality of times between the second reflector and the third reflector, the MEMS optical fiber attenuator leads coupling mismatch loss generated by small-angle change leading-in light spot translation to be far greater than coupling mismatch loss of the light beams caused by angle change by a plurality of times of reflection of the light beams on the second reflector and the third reflector through the distance between the super-long collimators, thereby achieving lower polarization dependent loss and wavelength dependent loss.
2. A MEMS fiber optic attenuator as claimed in claim 1 wherein: the MEMS optical fiber attenuator also comprises a fourth reflector, the light beam is reflected to the fourth reflector after being reflected for a plurality of times between the second reflector and the third reflector, and the light beam reflected by the fourth reflector enters the light receiving collimator.
3. A MEMS fiber optic attenuator as claimed in claim 1 wherein: the light output collimator and the light receiving collimator are both single-fiber collimators.
4. A MEMS fiber optic attenuator as claimed in claim 1 wherein: the MEMS drives the first mirror to rotate so as to change a direction of propagation of the light beam reflected by the first mirror.
5. A MEMS fiber optic attenuator as claimed in claim 1 wherein: the transmission distance of the light beam between the light output collimator and the light receiving collimator can be adjusted by changing the number of times the light beam is reflected between the second mirror and the third mirror.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610961710.XA CN108020886B (en) | 2016-11-04 | 2016-11-04 | MEMS optical fiber attenuator |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610961710.XA CN108020886B (en) | 2016-11-04 | 2016-11-04 | MEMS optical fiber attenuator |
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| Publication Number | Publication Date |
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| CN108020886A CN108020886A (en) | 2018-05-11 |
| CN108020886B true CN108020886B (en) | 2020-10-16 |
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| CN201610961710.XA Active CN108020886B (en) | 2016-11-04 | 2016-11-04 | MEMS optical fiber attenuator |
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Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TW495040U (en) * | 2001-10-31 | 2002-07-11 | Hon Hai Prec Ind Co Ltd | Electronic control light attenuator with U-shape light route |
| US7477827B2 (en) * | 2007-02-02 | 2009-01-13 | Jds Uniphase Corporation | Variable Optical Attenuator |
| CN201266248Y (en) * | 2008-07-29 | 2009-07-01 | 翔光(上海)光通讯器材有限公司 | Adjustable optical attenuator |
| CN101963685B (en) * | 2009-07-22 | 2015-08-12 | 北京波联汇成科技有限公司 | The adjustable optical attenuator of WDL is compensated by adjustment optical waveguide position |
| CN201478678U (en) * | 2009-09-10 | 2010-05-19 | 福州高意通讯有限公司 | Tension type folding-cavity laser |
| CN102645702A (en) * | 2011-02-22 | 2012-08-22 | 大连兆阳软件科技有限公司 | Novel small-sized mechanical variable laser attenuation device |
| TW201610496A (en) * | 2014-09-11 | 2016-03-16 | 波若威科技股份有限公司 | Variable optical attenuator with wavelength-dependent loss compensation |
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